Downlink resource control method and device for satellite hopping beam

Abstract

The invention relates to a cross-cell switching resource management method and device under satellite beam hopping, and belongs to the technical field of satellite communication. According to the invention, a resource adjustment strategy is executed according to the position of the terminal and the allocation condition of the beam resources, and resource allocation is carried out according to a decision sequence of only adjusting beam pointing, allocating other time slot resources in the beam to point to a new position area, changing beams to serve the terminal and changing satellites to allocate resources for the terminal, so that optimal use of resources by cross-cell switching terminals is ensured; the resource utilization rate is improved, large adjustment of resources is reduced as much as possible, and engineering implementation of satellite-ground products is facilitated.

Description

Technical Field

[0001] This invention belongs to the field of satellite communication technology, and specifically, it provides a method and apparatus for cross-cell handover resource management under satellite beam hopping. Background Technology

[0002] In satellite beam-hopping scenarios, beam-hopping adds a spatial dimension to the carrier and time dimensions of a point beam. When serving terminals with beam-hopping, the beam-hopping direction needs to be controlled based on the terminal's location. Especially when terminals move across cells, how to match the beam-hopping location with the mobile terminal's location without affecting existing service terminals and ensuring the mobile terminal's service is a challenge in beam-hopping.

[0003] To address this issue, several technical solutions have been proposed in technical standards and literature: (1) Resource allocation scheme for satellite fixed beam coverage Several of my country's satellite systems already possess the capability for autonomous onboard resource allocation. Due to the fixed beam coverage of satellites, the target area will be covered by the beam when the terminal is moving. When the terminal crosses beams, continuous service can be guaranteed simply by allocating resources at the target beam position through the satellite.

[0004] Due to the characteristic of hopping beams covering designated beam positions in time-division multiplexing, existing cross-beam resource allocation schemes are not applicable.

[0005] (2) Cross-cell resource allocation scheme in terrestrial mobile communication system In terrestrial mobile communication systems, the ground is divided into cells / sectors according to cellular structures. Taking a 4G system as an example, the base station monitors the signal strength of the terminal. If a weak signal is detected, the base station notifies the terminal to measure and report the signal strength of surrounding base stations. The current base station comprehensively evaluates multiple factors, such as signal strength and the load of each base station, to determine the target base station for handover and notifies the target base station to reserve resources. The source base station informs the terminal of the target base station and reserved resources, and the terminal performs the handover. After a successful handover, the resources of the source base station are released.

[0006] The base stations and location areas of the ground system remain unchanged, which differs from the beam-hopping scenario and is not applicable to satellite beam-hopping scenarios.

[0007] As can be seen from the above analysis, existing cross-cell resource allocation schemes focus on solving the communication process problem when terminals cross cells, but there is no design for resource allocation methods. Summary of the Invention

[0008] The technical problem solved by this invention is: addressing the dynamic adjustment of uplink resources when a terminal moves under a satellite hopping beam system. Combining the current beam resource occupancy and pointing information, a hierarchical resource adjustment strategy is proposed based on different scenarios of uplink resource allocation for hopping beams. This ensures optimized use of resources by the system when the terminal switches between ground cells, avoids large-scale reallocation of resources, and improves the stability and utilization of resource allocation.

[0009] The solution of this invention is: a cross-cell handover resource management method under satellite beam hopping. In the satellite constellation, each satellite is configured with multiple beams B1, B2, B3, ..., Bs. In each beam, the uplink uses an MF-TDMA system, that is, the uplink is divided into multiple carriers C1, C2, C3, ..., Cm. Each carrier uses a time-division multiplexing method, i.e., S1, S2, S3, ..., Sn. Under the beam hopping system, for a single time slot, all m carriers point to the same ground location area Li. The uplink resource allocation of the terminal adopts (B The terminal continuously monitors its own ground location area (i, Cj, St). If the ground location area remains unchanged, the uplink resource allocation remains unchanged. If the terminal moves from ground location area La to ground location area Lb, the terminal performs a resource adjustment strategy based on the usage of each carrier of the satellite beam and the allocation of satellite beam resources. The uplink resources are reallocated to the terminal in the following decision order: adjusting only the beam pointing, allocating other time slot resources within the beam to point to the new location area, changing the beam to serve the terminal, and changing the satellite to allocate resources to the terminal.

[0010] Preferably, the specific method for reallocating uplink resources to the terminal UE is as follows: Step 1: Check whether all carriers of beam Bi serve only the terminal UE in time slot St. If yes, control beam Bi to point to ground location area Lb in time slot St; otherwise, proceed to step 2. Step 2: Check if beam Bi has other time slots pointing to ground location area Lb and has idle carriers. If yes, allocate the idle carrier of the corresponding time slot to the terminal UE; otherwise, proceed to step 3. Step 3: Allocate a new beam and its carrier to the terminal UE. In time slot St, control the new beam and carrier to point to the ground location area Lb.

[0011] Preferably, the above-mentioned cross-cell handover resource management method under satellite beam hopping further includes the following steps: If the ground location area Lb is still covered by other satellites in the constellation, and there are no new link resources available for the satellite corresponding to the current uplink resource allocation of the terminal UE, then the uplink resources will be allocated to the terminal UE by a new satellite, and the terminal UE will build the uplink through the new satellite.

[0012] Preferably, the ground location area is a location zone on the Earth's surface divided according to latitude and longitude.

[0013] Another technical solution of the present invention is: a cross-cell handover resource management device under satellite beam hopping. The device executes a resource adjustment strategy according to the terminal location and the allocation of satellite beam resources. The resource allocation is carried out in the following decision order: adjusting only the beam pointing, allocating other time slot resources within the beam to point to the new location area, changing the beam to serve the terminal, and changing the satellite to allocate resources for the terminal. The decision order of cross-cell resource allocation is to reallocate uplink resources for the terminal.

[0014] Preferably, the device uses the method described in claim 2 to reallocate uplink resource allocation for terminal UEs across ground satellite regions.

[0015] Preferably, the resource management device is deployed on a satellite or ground equipment.

[0016] The advantages of this invention compared to the prior art are: This invention implements a resource adjustment strategy based on the terminal location and beam resource allocation. The resource allocation follows a decision sequence of adjusting only the beam direction, allocating other time slot resources within the beam to the new location area, changing the beam service for the terminal, and changing the satellite to allocate resources for the terminal. This ensures optimized use of resources for terminals handing over to different cells, improves resource utilization, minimizes large resource adjustments, and facilitates the engineering implementation of satellite-ground products. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the ground location area according to an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the existing resource allocation for terminal A in an embodiment of the present invention (beam Bi only serves terminal A).

[0019] Figure 3 This is a schematic diagram of the existing resource allocation for terminal A in an embodiment of the present invention (beam Bi also serves other terminals).

[0020] Figure 4 This is an embodiment of the present invention. Figure 2 The corresponding existing resource allocation.

[0021] Figure 5 This is an embodiment of the present invention. Figure 3 The corresponding existing resource allocation.

[0022] Figure 6 This is a resource allocation decision based on the fact that all time slots of the beam currently occupied by terminal A in this embodiment of the invention have been allocated. Detailed Implementation

[0023] The present invention will be further described below with reference to the embodiments.

[0024] This invention provides a cross-cell handover resource management method under satellite beam hopping. In the satellite constellation, each satellite is configured with multiple beams B1, B2, B3, ..., Bs. In each beam, the uplink uses an MF-TDMA system, that is, the uplink is divided into multiple carriers C1, C2, C3, ..., Cm, and each carrier uses a time-division multiplexing method, i.e., S1, S2, S3, ..., Sn. Under the beam hopping system, for a single time slot, all m carriers point to the same ground location area Li. The uplink resource allocation of the terminal adopts (Bi, C... (j, St) represents the terminal continuously monitoring its own ground location area. If the ground location area remains unchanged, the uplink resource allocation remains unchanged. If the terminal moves from ground location area La to ground location area Lb, then, based on the usage of each carrier of the satellite beam and the allocation of satellite beam resources, a resource adjustment strategy is executed. The decision sequence is: adjusting only the beam pointing, allocating other time slot resources within the beam to point to the new location area, changing the beam serving the terminal, and changing the satellite to allocate resources for the terminal. The uplink resources are reallocated to the terminal in the following order: adjusting only the beam pointing, allocating other time slot resources within the beam to point to the new location area, changing the beam serving the terminal, and changing the satellite to allocate resources for the terminal. The ground location area is a location cell on the Earth's surface divided according to latitude and longitude, such as... Figure 1 As shown.

[0025] The specific method for reallocating uplink resources to the terminal UE in the above method is as follows: Step 1: Check whether all carriers of beam Bi serve only the terminal UE in time slot St. If yes, control beam Bi to point to ground location area Lb in time slot St; otherwise, proceed to step 2. Step 2: Check if beam Bi has other time slots pointing to ground location area Lb and has idle carriers. If yes, allocate the idle carrier of the corresponding time slot to the terminal UE; otherwise, proceed to step 3. Step 3: Allocate a new beam and its carrier to the terminal UE. In time slot St, control the new beam and carrier to point to the ground location area Lb.

[0026] If the ground location area Lb is still covered by other satellites in the constellation, and there are no new link resources available for the satellite corresponding to the current uplink resource allocation of the terminal UE, then the uplink resources will be allocated to the terminal UE by a new satellite, and the terminal UE will build the uplink through the new satellite.

[0027] This invention also provides a cross-cell handover resource management device under satellite beam hopping. This device executes a resource adjustment strategy based on the terminal location and satellite beam resource allocation. Resource allocation follows a decision sequence: adjusting only the beam pointing, allocating other time slot resources within the beam to point to the new location area, changing the beam serving the terminal, and changing the satellite to allocate resources for the terminal. The cross-cell resource allocation decision sequence prioritizes the reallocation of uplink resources for the terminal. The resource management device can be deployed on a satellite or ground equipment.

[0028] Example: The following is in conjunction with the appendix Figures 2-6 The specific embodiments shown will be described in detail below.

[0029] like Figure 2 As shown, terminal A is currently located in region La. When performing business, the resource management module allocates resources to it, and the resources are represented as (Bi, Cj, St). S1. When terminal A moves during the service process, it continuously detects its current location area. If its location area remains unchanged, the service continues; otherwise, S5 is executed. S2. If terminal A detects that it has moved out of the current location area and entered a new location area Lb, it reports this information to the resource management module. S3. The resource management module checks whether all carriers in time slot St of beam Bi serve only terminal A. If so, ... Figure 2 As shown, the control beam Bi points to the position region Lb in time slot St, as follows: Figure 4 As shown, conversely, as Figure 3 As shown, execute S4; S4. The resource management module checks if beam Bi has other time slots pointing to location area Lb and if there are idle carriers. If so, it allocates the idle carrier of the corresponding time slot to terminal A. Figure 5 As shown, conversely, execute S5; S5. The resource management module searches for an idle time slot under Bi, allocates the carrier in it to terminal A, and controls the beam of the time slot to point to location area Lb. S6. If beam Bi has no such idle time slot, the resource management module searches for a new beam, such as... Figure 6 As shown, S5-S6 are executed repeatedly; S7. If the location area Lb is still covered by other satellites, the resource management module will allocate resources to the UE under the new satellite.

[0030] This invention proposes a method and apparatus for cross-cell handover resource management under satellite beam hopping. Based on the terminal location and beam resource allocation, a resource adjustment strategy is executed. The resource allocation follows a decision sequence of adjusting only the beam direction, allocating other time slot resources within the beam to point to the new location area, changing the beam to serve the terminal, and changing the satellite to allocate resources for the terminal. This ensures optimized use of resources by the cross-cell handover terminal, improves resource utilization, minimizes large resource adjustments, and facilitates the engineering implementation of satellite-ground products.

[0031] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A method for managing resources for cross-cell handover under satellite hop-beam, characterized in that In the satellite constellation, each satellite is configured with multiple beams B1, B2, B3, …, Bs, and in each beam, the uplink is of MF-TDMA system, i.e., the uplink is divided into multiple carriers C1, C2, C3, …, Cm, and each carrier uses time division, i.e., S1, S2, S3, …, Sn, and under the beam hopping system, for a single time slot, all the m carriers are directed to the same ground location area Li; the uplink resource allocation of the terminal is represented by (Bi, Cj, St), and the terminal continuously monitors the ground location area where it is located, and if the ground location area does not change, the uplink resource allocation remains unchanged, and if the terminal moves from the ground location area La to the ground location area Lb, according to the use of each carrier of the satellite beam, the terminal position, and the allocation of the satellite beam resource, a resource adjustment strategy is executed, and the decision sequence of only adjusting the beam pointing, allocating other time slot resources in the beam to point to a new location area, changing the beam to serve the terminal, and changing the satellite to allocate resources for the terminal is used to reallocate the uplink resource of the terminal.

2. The method of claim 1, wherein, The specific method for reallocating the uplink resource of the terminal UE is as follows: Step one, check whether all the carriers of the beam Bi in the time slot St only serve the terminal UE, yes, control the beam Bi to point to the ground location area Lb in the time slot St; otherwise, go to step two; Step two, check whether the beam Bi has other time slots pointing to the ground location area Lb and has idle carriers, yes, allocate the idle carriers of the corresponding time slots to the terminal UE, otherwise, go to step three; Step three, allocate a new beam and its carriers to the terminal UE, and control the new beam and the carriers to point to the ground location area Lb in the time slot St.

3. The method of claim 1, wherein, Further comprising the following steps: If the ground location area Lb is also covered by other satellites in the constellation, when the satellite corresponding to the current uplink resource allocation of the terminal UE does not have new link resources to allocate, the terminal UE is allocated uplink resources by a new satellite, and the terminal UE builds the uplink through the new satellite.

4. The method of claim 1, wherein, The ground location area is a location cell on the earth surface divided according to longitude and latitude.

5. A device for managing resources for cross-cell handover under satellite hop-beam, characterized in that, The device executes a resource adjustment strategy according to the terminal position and the allocation of the satellite beam resource, and performs resource allocation according to the decision sequence of only adjusting the beam pointing, allocating other time slot resources in the beam to point to a new location area, changing the beam to serve the terminal, and changing the satellite to allocate resources for the terminal, and the decision sequence of cross-cell resource allocation is used to reallocate the uplink resource of the terminal.

6. A cross-cell handoff resource management apparatus for a satellite hopping beam, for performing the method of claim 2, wherein, The device reallocates the uplink resource of the terminal UE across the ground satellite area by using the method of claim 2.

7. The cross-cell handover resource management apparatus for satellite's beam hopping under the satellite's beam hopping according to claim 6, characterized in that, The resource management device is deployed on a satellite or a ground device.

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